SI-8005Q-TL

1- 1-3 DC/DC Converter ICs SI-8000Q Series Surface Mount, Current Mode Control Step-down Switching Mode ■ Features ■ Absolute Maximum Ratings • Compact surface-mount package (HSOP8) Parameter Input Voltage Symbol • Output current: 3.5A Power Dissipation*1 PD • High efficiency: 90% (Vo = 5 V) Junction Temperature*2 Tj –30 to +1 50 °C Tstg –40 to +1 50 °C • Introduction of current mode control method Storage Temperature • Built-in reference oscillator (500 kHz) Ratings 30 VIN Unit V 1.35 W • A ceramic capacitor can be used for output Thermal Resistance (junction to case) θj-c 40 °C/W • Built-in drooping-type over current and thermal protection circuits Thermal Resistance (junction to ambient air) θj-a 74 °C/W • Built-in soft start circuit Conditions When mounted on glass–epoxy board, 30×30 mm (copper laminate area : 25×25 mm) When mounted on glass epoxy board, 30×30mm (copper laminate area : 25×25 mm) *1 : Limited by thermal protection circuit *2: Note that the detection temperature for thermal protection is about 140°C. • Built-in on/off function (Active Hi) ns • Low current consumption during off ■ Applications es ig • DVD recorder, FPD-TV • Onboard local power supplies • OA equipment Symbol Ratings SI-8005Q DC Input Voltage Range VIN Vo+3*1 to 28 Output Voltage Range VO 0.5 to 24 Output Current Range IO 0to3.5 Tjop –30 to +125 Operating Temperature Range Top –30 to +85 *1 : The minimum value of the input voltage range is 4.75 V or Vo +3 V, whichever is higher. Parameter fo (R1=46kΩ, R2=5.1kΩ when Ta = 25°C and Vo=5V) d ■ Electrical Characteristics Symbol 0.485 VADJ Conditions ∆VADJ/∆T en Temperature Coefficient of Reference Voltage Conditions η m Efficiency de min. Reference Voltage fo 450 m ec o ot R SS Pin N Quiescent Circuit Current Outflow Current at Low Voltage Low Level Voltage Inflow Current at Low Low Voltage Rating SI-8005Q Unit typ. max. 0.500 0.515 0.05 500 mV/°C % 550 60 30 Conditions 60 VIN=12V, Io=0.1 to 3.5A 3.6 6.0 Conditions VIN=12V 18 Conditions kHz mV mV A mA VIN=12V, Io=0A, VEN=open 20 Iq(OFF) Conditions VIN=12V, Io=0A, VEN=0V 5 ISSL Conditions V Conditions VIN=12V 2.2 Vc/L Conditions VIN=12V 5 IC/E H µA µA VIN=1 6V, VSSL=0V 2.8 Vc/N V VIN=12V, Io=1A VIN=8 to 28V, Io=1 A Iq High Level Voltage EN Pin °C 30 Conditions IS A °C VIN=16V, Io=1A ∆VOLAD Over current Protection Starting Current V 90 ∆VOLNE Load Regulation V VIN=12V, Io=1A Conditions Line Regulation Conditions VIN=12V, Io=1 A, Ta=–40 to +85°C Conditions Oscillation Frequency rN Operating Junction Temperature Range Unit ew Parameter D ■ Recommended Operating Conditions Conditions VEN=0V V µA Error Amplifier Voltage Gain AEA 1000 Error Amplifier Transformer Conductance GEA 800 V/V µA/V Current Sense Amplifier Impedance 1/GCS 0.35 V/A Maximum ON Duty DMAX 92 % Minimum ON Time DMIN 100 nsec. *: Pin 8 is the SS pin. Soft start at power on can be performed with a capacitor connected to this pin. The SS pin is pulled up to the power supply in the IC, so applying the external voltage is prohibited. SI-8008Q 8 SS C8 30 ICs Soft start SI-8000Q Series ■External Dimensions (HSOP8) Pin Assignment 1BS 2IN 3SW 4GND 5FB 6COMP 7EN 0.08±0.08 6.20 4.40 Pin 1 Mark 0.05±0.05 (Unit : mm) Enlarged View of A 1.50 0.695 TYP 5.20 0.15 A 8SS 0.4 ns 1.27 0.40 Plastic Mold Package Type 2.70 es ig Flammability: UL 94V-0 Product Mass: Approx. 0.1 g ew D 2.90 Current Sense Amp OSC Boot REG d OCP 5v_ldo de P.REG 2 IN fo rN ■Block Diagram 1 BS VREF 0.5V ON OFF m PWM LOGIC OVP TSD Drive 3 SW 5v_ldo 5 FB Amp UVLO 0.5V ec o m 6 COMP en 7 EN 4 GND 8 SS N ot R ■Typical Connection Diagram VIN 7 1 BS 2 IN EN C4 R1 SI-8000Q 8 C1 SS GND COMP 6 C5 C6 OPEN C3 R3 VO L1 SW 3 FB 5 D1 GND 4 VFB C2 R2 IADJ GND C1:10µF/50V (Murata:GRM55DB31H106KA87) C2:22µF/16V (Murata:GRM32ER71A226KE20) C3:560pF*1 (Murata:GRM18 Type) C4:10nF (murata: GRM18 Type) C5:10nF (murata: GRM18 Type) L1:10µH D1:SJPW-T4 (Sanken) R1:46kΩ (Vo=5V) R2:5.1kΩ R3:24kΩ *1 *1: When Vo=5V ICs 33